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1C 9067 



Bureau of Mines Information Circular/1986 



Results of Direct-Method Determination 
of the Gas Content of U.S. Coalbeds 

By W. P. Diamond. John C. LaScola, and D. M. Hyman 




UNITED STATES DEPARTMENT OF THE INTERIOR 



S^Vi 






Information Circular 9067 



Results of Direct- Method Determination 
of the Gas Content of U.S. Coalbeds 

By W. P. Diamond, John C. LaScola, and D. M. Hyman 




UNITED STATES DEPARTMENT OF THE INTERIOR 
Donald Paul Hodel, Secretary 

BUREAU OF MINES 
Robert C. Horton, Director 




-v 



^5 



^0 



c\0 



frH 



Library of Congress Cataloging in Publication Data: 



Diamond, W. P. (William P.) 

Results of direct-method determination of the gas content of U.S. 
coalbeds. 

(Bureau of Mines information circular ; 9067) 

Bibliography: p. 6-7. 

Supt. of Docs, no.: I 28.27: 9067. 

1. Coalbed methane— United States— Measurement. 2. Mine venti- 
lation. I. LaScola, JohnC. II. Hyman, D. M. (David M.). III. Title. 
IV. Series: Information circular (United States. Bureauof Mines) ;j 9067. 



TN295.U4 [TN305] 622s [622'. 334] 86-600304 



CONTENTS 



Page 



Abstract 1 

Introduction. 2 

Acknowledgments 4 

Equipment and procedures 4 

Sampling 4 

Test equipment 4 

Calculation of gas content 4 

Auxiliary test procedures 5 

Summary 6 

References „ 6 

Appendix. — Results of direct-method gas-content determinations on U.S. coal 

samples 8 

ILLUSTRATION 

1. Equipment for direct-method testing of coal samples 4 

TABLES 

1. Distribution of coal core samples, by State 2 

2. Estimates of total in-place methane volumes for U.S. coalbeds 2 

3. In-place gas volumes of selected U.S. coalbed areas 3 

4. Highest measured gas contents of U.S. coalbeds..... 3 

5. States with highest measured gas emissions from coal mines 3 

A-l. Results of direct-method gas-content determinations on U.S. coal samples, 

by coalbed 10 

A-2. Results of direct-method gas-content determinations on U.S. coal samples, 

by State 52 





UNIT OF MEASURE ABBREVIATIONS 


USED IN 


THIS REPORT 


cm 3 


cubic centimeter 


h 


hour 


cm 3 /g 


cubic centimeter per gram 


lb/in 2 


pound per square inch 


ft 


foot 


mi 2 


square mile 


ft 3 


cubic foot 


pet 


percent 


ft 3 /st 


cubic foot per short ton 







RESULTS OF DIRECT-METHOD DETERMINATION OF THE GAS 
CONTENT OF U.S. COALBEDS 

By W. P. Diamond, ] John C. LaScola, 2 and D. M. Hyman ] 



ABSTRACT 

In 1972, the Bureau of Mines developed a direct-method test for mea- 
suring the gas content of virgin coal core samples for coal mine health 
and safety considerations. Since that time, approximately 1,500 coal 
samples from more than 250 coalbeds in 17 States have been collected for 
gas content determination. The gas content data, when combined with 
geologic and engineering studies, can be used as a basis for a prelim- 
inary estimate of mine ventilation requirements, and to determine if 
methane drainage in advance of mining should be considered. The data 
are also critical in delineating coalbed methane resources and in utili- 
zation feasibility studies. 

This report makes the Bureau's extensive data base of gas content data 
more readily available to the coal and gas industries. The data are 
presented in tabular form, alphabetically by coalbed name and by State. 
The components of the total gas content (lost, desorbed, and residual 
gas) are given. Location (State and county), sample depth, coalbed or 
formation name, and coal rank are included for geographic and geologic 
identification. 



* Geologist. 
^Physical scientist. 
Pittsburgh Research Center, Bureau of Mines, Pittsburgh, PA. 



INTRODUCTION 



The Bureau of Mines began measuring 
the gas content of virgin coal core 
samples in 1972 as part of its compre- 
hensive Coal Mine Health and Safety 
research program (1_). 3 The original 
reason for determining the gas content 
of coal was for estimating the amount 
of gas that would be released in active 
underground mining operations (2-4) . 
The gas content values can be used for 
mine planning and resource delineation 
and for utilization feasibility studies 
(j^-6_) • In a continuing effort to pro- 
vide the coal and gas industry with 
readily available information, this pub- 
lication presents the Bureau's data 
base on the gas content of U.S. coalbeds 
in tabular form. Data on 1,511 coal 
core samples from more than 250 coalbeds 
in 17 States are presented. Table 1 
gives the distribution of samples by 
State. 

It is estimated that coalbeds in 
the United States contain as much as 
766 trillion ft 3 of in-place gas (table 
2). The gas is distributed in various 
amounts throughout the extensive coal 
deposits of the United States. Esti- 
mates (10-19) of in-place gas volumes 
for several coalbeds or coal-bearing 
formations in selected geographic ar- 
eas have been made (table 3). It is 
very important to realize that these 
values are for in-place gas volumes and 
do not represent the volume of gas that 
can be physically and/or economically 
recovered by coalbed gas drainage sys- 
tems. Gas contents ranging from essen- 
tially 0.0 cm 3 /g to 21.6 cm 3 /g (0.0 ft 3 / 
ton to 691 ft 3 /ton in-place) have been 
measured. Table 4 is a list of the 
highest measured gas contents of U.S. 
coalbeds. 



■^Underlined numbers in parentheses re- 
fer to items in the list of references 
preceding the appendix. 



TABLE 1. - Distribution of coal 
core samples, by State 



State 

Alabama , 

Colorado , 

Illinois , 

Indiana , 

Kentucky , 

Montana , 

North Carolina. 
New Mexico. 

Ohio , 

Oklahoma , 

Pennsylvania. . , 

Tennessee , 

Utah , 

Virginia , 

Washington. 
West Virginia. , 

Wyoming , 

Total. 



Number_of_ 
samples 

214 

177 

25 

61 

21 

34 

2 

36 

15 

27 

393 

3 

276 

40 

6 

140 

41 

1,511 



TABLE 2. - Estimates of total in-place 
methane volumes for U.S. coalbeds, 
trillion cubic feet 

Source 

Bureau of Mines (7)...-. 766 

U.S. Department of Energy (8).... 50-700 
National Petroleum Council (9)... 398 



An indirect measure of the possible 
safety hazard of methane in coal mines, 
as well as the resource potential of 
coalbed methane, is the volume of gas 
vented from U.S. coal mines. As of the 
last survey by the Bureau of Mines in 
1980 (20), over 256 million ft 3 of meth- 
ane per day was being vented. The seven 
States with the highest methane emissions 
are listed in table 5. Seventy indi- 
vidual mines vented 1 million ft 3 of 
methane or more per day. 



TABLE 3. - In-place gas volumes of selected U.S. coalbed areas 



Area, 


Volume , 


Reference 


mi 2 


lO 12 


ft^ 




43,700 




61.0 


10 


1,575 




31.3 


19 


6,570 


30.0- 


110.0 


10 


414 




14.0 


11 


22,850 


10.0- 


48.0 


10 


25,800 


5.9- 


39.4 


10 


2,200 


8.0- 


18.4 


10 


53,000 


5.2- 


21.1 


10 


14,400 


5.0- 


10.0 


10 


6,500 


3.6- 


24.0 


10 


19,000 


1.8- 


31.0 


10 


5,300 


1.6- 


3.6 


10 


835 




1.8 


13 


179 




1.56 


18 


1,300 




1.5 


12 


276 


1.4- 


10.0 


15 


600 


1.1- 


1.5 


14 


3,800 


.5- 


2.2 


10 


21,200 


.2- 


30.9 


10 


11,100 


.2- 


.8 


10 


500 


.2- 


.4 


17 


200 




.1 


16 



Northern Appalachian Basin — OH, PA, MD, WV, KY... 
Mesaverde Formation (southern Piceance Basin) — CO 

Piceance Basin — CO 

Mesaverde Formation (Sandwash Basin) — CO 

Central Appalachian Basin — KY, MD, TN, VA, WV.... 

Powder River Basin — MT, WY 

Raton Mesa region — CO , NM 

Illinois Basin— IL, IN, KY 

Black Warrior Basin — AL, MS 

Western Washington region — WA 

San Juan Basin — CO, NM 

Arkoma Bas in — OK , AR 

Mary Lee Coal group — AL 

Vermej o Formation — CO 

Pittsburgh Coalbed — PA, WV 

Fruitland Formation — CO „ 

Lower Hartshorne Coalbed — OK 

Wind River region — WY 

Greater Green River region — WY , CO 

Uinta region — UT , CO 

Upper Freeport Coalbed — PA 

Beckley Coalbed — WV 



TABLE 4. - Highest measured gas contents of U.S. coalbeds 



Coalbed or 


County and State 


Depth, 
ft 


Gas content 


Coal rank 


formation 




1 cm/g 


2 ft 3 /st 




Peach Mountain. . . 
Pocahontas No. 3. 


Schuylkill, PA.. 
Buchanan, VA. . . . 
Tuscaloosa, AL.. 
Schuylkill, PA.. 
Tuscaloosa, AL., 
Le Flore, OK. . . . 
Sublette, WY... 
Las Animas , CO. . 
Raleigh, WV.... 
Tuscaloosa, AL. 




685 
1,864 
1,504 

608 
2,132 
1,439 
3,496 
1,158 

830 
1,365 


21.6 
21.5 
18.7 
18.3 
17.5 
17.1 
17.0 
17.0 
15.3 
15.1 


691 
688 
598 
586 
560 
547 
544 
544 
490 
483 


Anthracite. 

Low-volatile bituminous. 
High-volatile A bituminous. 
Anthracite. 


Tunnel 


Mesaverde Group.. 
Vermejo Formation 


Medium-volatile bituminous. 

ND. 

High-volatile A bituminous. 

Low-volatile bituminous. 

Medium— volatile bituminous. 




ND. 



ND Not determined. laboratory derived. 2 Estimated in-place. 



TABLE 5. - States with highest measured gas emissions 
from coal mines, 1980, million cubic feet per day 



State 



Emissions 



West Virginia 89.1 

Alabama. 51.4 

Pennsylvania 39.8 

Virginia 35.0 

Illinois 17.4 

Colorado 9.3 



ACKNOWLEDGMENTS 



The Bureau of Mines greatly appreci- 
ates the cooperation of numerous coal 
and gas companies and State and Federal 
agencies in providing exploratory coal 
cores for gas content determinations. 



Appreciation is also extended to the U.S. 
Department of Energy for allowing the Bu- 
reau access to gas content data collected 
by its contractors. 



EQUIPMENT AND PROCEDURES 



SAMPLING 



Coal samples for gas content testing 
are usually obtained by the Bureau from 
exploratory coreholes of private coal 
companies. Because of quality testing 
needs of coal companies, it is generally 
possible to obtain only enough sample for 
one gas test on a coalbed. Therefore, it 
has been Bureau practice to obtain the 
cleanest section of coal; that is, coal 
without obvious extraneous shale, pyrite, 
or other noncoal inclusions. Multiple 
testing, or even testing of the entire 
coalbed, would be the preferable sam- 
pling procedure. A more thorough discus- 
sion of sampling strategy is presented in 
reference 5. 



TEST EQUIPMENT 



The equipment (fig. 1) required to mea- 
sure the actual volume of gas desorbing 
from the coal sample consists of a sample 
container, an inverted graduated cylinder 
sitting in a pan filled with water, and a 
ring stand and clamps to hold the gradu- 
ated cylinder in place. The desorbed gas 
that collects in the sample container is 
periodically bled into the graduated cyl- 
inder and measured as the volume of water 
displaced. This procedure is performed 
at the drill site and, subsequently, in 
the laboratory. A more thorough discus- 
sion of the test equipment and procedure, 
including detailed diagrams of sample 
containers, is presented in reference 2. 



CALCULATION OF GAS CONTENT 



The gas content of a sample is composed 
of lost, desorbed, and residual gas, each 
of which is determined by slightly dif- 
ferent techniques. A core sample begins 
to desorb gas before it is sealed in the 
sample container. The amount of this 
lost gas depends on the drilling medium 
and the time required to retrieve, mea- 
sure, and describe the core and seal the 
sample in the can. The shorter the time 
required to collect the sample and seal 
it in the can, the greater the confidence 
in the lost-gas calculation. In general, 
because of its speed, wire-line retrieval 
of the core is preferable to conventional 
coring. If air or mist is used in drill- 
ing, it is assumed that the coal begins 
desorbing gas immediately upon penetra- 
tion by the bit. With water, desorption 
is assumed to begin when the core is 
halfway out of the hole; that is, when 
the gas pressure is assumed to exceed 
that of hydrostatic head. 

The lost gas can be calculated by a 
graphical method based on the following 
relationship: For the first few hours of 



emission, the volume of gas given off is 
proportional to the square root of the 
desorption time. A plot of the cumula- 
tive emission after each reading against 
the square root of the time that the sam- 
ple has been desorbing ideally would pro- 
duce a straight line (2). 



Valve 



50-lb/in gauge /Tpx 



nverted graduated 
cylinder 




Pan of water 



FIGURE 1. - Equipment for direct-method testing 
of coal sample. 



The desorbed gas is simply the total 
volume of gas drained from the sample and 
measured in the graduated cylinder. The 
desorbing of a sample is generally al- 
lowed to continue until a very low emis- 
sion rate is obtained, generally an aver- 
age of less than 10 cm 3 of gas per day 
for 1 week. The time required to reach 
this low rate of emission will vary con- 
siderably depending on the size of the 
sample, the physical characteristics of 
the coal, and the amount of gas contained 
in the sample. 

At the point at which it is determined 
to discontinue the measurement of de- 
sorbed gas, the coal sample will usually 
still contain gas. To complete the gas 
determination procedures, the amount of 
residual gas must be measured. The pro- 
cedure recommended by the Bureau is to 
crush the coal in a sealed ball mill. 
Methods previously used, including a 
crushing box and a graphical procedure, 
were found to be unreliable (2^) . The 
ball mill is tumbled on a roller machine 
for approximately 1 h to crush the coal. 
The mill is allowed to cool to room tem- 
perature, and the volume of gas released 
is measured by the water displacement 
method. The crushed powder and any un- 
crushed lumps are weighed separately. 



The volume of gas released is attributed 
only to the crushed powder. The total 
gas content of a particular sample is the 
volume of lost gas and desorbed gas di- 
vided by the total sample weight plus the 
residual gas content. 

Theoretically, it is possible to crush 
a coal sample in the ball mill at any 
point after collection and to obtain the 
total gas content (excluding lost gas) of 
the sample. This procedure generally is 
not considered appropriate if maximum in- 
formation from the sample is desired. By 
crushing the sample before the desorption 
process is complete, it is impossible to 
obtain the relative amounts of desorbed 
and residual gas. This distinction is 
important because the actual residual 
gas, which will not desorb from the sam- 
ple while sealed in the canister, proba- 
bly represents gas that will not flow to 
a methane drainage borehole, and possibly 
represents gas that will not be emitted 
into a mine atmosphere. During the pro- 
cess of mining coal, the coal is broken 
up into variously sized pieces; however, 
the majority of these pieces usually will 
not duplicate the very fine powder that 
the ball mill produces in the residual 
gas procedure. 



AUXILIARY TEST PROCEDURES 



The gas content values listed in the 
appendix of this report are at ambient 
field as well as laboratory conditions 
and have not been corrected to standard 
temperature and pressure (STP). The di- 
rect-method test as originally developed 
by the Bureau of Mines' was intended to be 
a "simple," inexpensive procedure that 
could be easily utilized by the mining 
industry to determine the methane poten- 
tial of coalbeds. An assessment of the 
potential influence of temperature and 
barometric pressure on the direct-method 
values under the general environmental 
conditions expected did not seem to jus- 
tify the additional expense and complica- 
tions of including an STP correction ca- 
pability in the procedure. In support of 
this original premise, the results of a 
recent study (21) conducted on 22 coal 
samples from Alabama showed that desorp- 
tion values corrected for STP averaged 



5.3 pet less than the ambient values, 
with the range being 4.4 to 7.0 pet. The 
Bureau of Mines is testing apparatus and 
procedures to conveniently integrate STP 
corrections into the direct-method test 
procedures for those who desire the rela- 
tively small increase in accuracy. To 
enhance the reliability of the test re- 
sults in the Bureau of Mines procedure, 
the desorption environment is maintained 
as constant as possible, especially with 
regard to temperature, which can be con- 
trolled once the sample is taken from the 
field to the laboratory. 

An additional factor currently under 
investigation that appears to influence 
the measured gas volume is 
and/or reaction of oxygen 
(air trapped with the coal 
the container is initially 
the coal sample. Preliminary studies in- 
dicate that the phenomenon occurs to 



the sorption 

and nitrogen 

sample when 

sealed) with 



varying degrees; however, all the factors 
that influence the magnitude of the im- 
pact on the final gas content value are 
currently unknown. Compositional analy- 
sis of the gas in sealed containers with 
coal samples indicates that sorption and/ 
or reaction of oxygen and nitrogen with 
the coal is more obvious several days 
after the sample has been placed in the 
desorption container. This sorption and/ 
or reaction will generally stabilize be- 
fore the desorption of methane is com- 
plete. In order to quantify the affect 
of sorption and/or reaction of oxygen and 
nitrogen on the gas content values, a gas 
compositional analysis must be made each 
time a gas volume is measured by the wa- 
ter displacement method. Periodic gas 
compositional analysis have been recom- 
mended by the Bureau of Mines (_2, _5) for 
several years to determine the percent of 
methane as well as any other gases such 
as carbon dioxide that make up the de- 
s orbed gas volume. Since the amount of 
"free" space in the desorption container 
after adding the coal sample controls the 
amount of air initially trapped within 
the container, keeping this free space to 
a minimum by filling the "standard" size 
containers as full as possible with coal, 
or having containers of various sizes 
available for various coal sample sizes 
will help minimize any gas sorption and/ 
or reaction problem. 



Proximate, ultimate, and Btu analyses 
are obtained on the crushed powder from 
the residual gas test. These test re- 
sults can be used to further evaluate 
the gas content results on a practical 
and theoretical basis. Because the gas 
content is presented as a volume-to- 
weight ratio, the presence of noncoal ma- 
terial, primarily shale and pyrite — which 
add weight but not gas storage capacity — 
can produce seemingly erroneous data. 
Thus, two samples from the same coalbed 
core may have gas contents that vary by 
several cubic centimeters per gram if one 
sample contains appreciably higher non- 
coal material. The coal analysis will 
help determine if noncoal material is in- 
fluencing the total gas content. 

Theoretical studies on the influence 
of depth of burial on the gas content 
are done preferably on a clean-coal ba- 
sis, thus removing the noncoal-material 
variable from the evaluation. However, 
because coalbeds do contain noncoal ma- 
terial, the actual in-place methane in a 
particular volume of coal should be re- 
lated to the as-received coal data. 

Theoretically, the gas content of coal 
is influenced by the rank of the coal, 
with higher ranks generally having higher 
gas contents. The coal analysis can be 
used to determine the apparent rank of 
the coal by ASTM Standard D388 (22) for 
evaluation of the rank parameter. 



SUMMARY 



Gas content determinations are report- 
ed on 1,511 virgin coal core samples col- 
lected since 1972. The results of these 
determinations and associated tests are 
summarized in tabular form in the ap- 
pendix. Additional coal samples con- 
tinue to be acquired for gas content de- 
termination. New data are entered into 
the Bureau's coalbed methane data base 
(23) from which this report has been syn- 
thesized. Updated printouts of data from 
specific coalbeds or geographic areas are 
available from the Bureau's Pittsburgh 
Research Center. 



The gas content data contained in this 
report, when combined with geologic and 
engineering studies, can be used as a ba- 
sis for a preliminary estimate of mine 
ventilation requirements, and to deter- 
mine if methane drainage in advance of 
mining should be considered. The distri- 
bution of gas volumes in a region can be 
used to delineate areas of high in-place 
gas volumes where mining may be adversely 
affected but where resource recovery and 
utilization may be enhanced. 



REFERENCES 



1. Skow, M. L. , A. G. Kim, and M. 
Deul. Creating a Safer Environment in 
U.S. Coal Mines. The Bureau of Mines 



Methane Control Program, 1964-79. A Bu- 
reau of Mines Impact Report. BuMines 
Spec. Publ. , 1980, 50 pp. 



2. Diamond, W. P., and J. R. Levine. 
Direct Method Determination of the- Gas 
Content of Coal: Procedures and Results. 
BuMines RI 8515, 1981, 36 pp. 

3. MuCulloch, C. M. , J. R. Levine, 
F. N. Kissell, and M. Deul. Measuring 
the Methane Content of Bituminous Coal- 
beds. BuMines RI 8043, 1975, 22 pp. 

4. Kissell, F. N. , C M. McCulloch, 
and C. H. Elder. The Direct Method of 
Determining Methane Content of Coalbeds 
for Ventilation Design. BuMines RI 7767, 
1973, 17 pp. 

5. Diamond, W. P. Site-Specific and 
Regional Geologic Considerations for 
Coalbed Gas Drainage. BuMines IC 8898, 
1982, 24 pp. 

6. . Evaluation of the Methane 

Gas Content of Coalbeds: Part of a Com- 
plete Coal Exploration Program for Health 
and Safety and Resource Evaluation. Pa- 
per in Coal Exploration (Proc. 2d Int. 
Coal Exploration Symp., Denver, CO, Oct. 
1-4, 1978). Miller Freeman Publ. , v. 2, 
1979, pp. 211-222. 

7. Deul, M. , and A. G. Kim. Methane 
Drainage — An Update. Min. Congr. J. , v. 
64, No. 7, 1978, pp. 38-42. 

8. U.S. Department of Energy. Na- 
tional Energy Plan II, A Report to the 
Congress Required by Title VIII of the 
Department of Energy Organization Act. 
May 1979, p. 95. 

9. National Petroleum Council. Un- 
conventional Gas Sources, Volume II, Coal 
Seams. June 1980, p. 14. 

10. Rightmire, C. T., G. E. Eddy, and 
J. N. Kirr. Coalbed Methane Resources of 
the United States. Am. Assoc. Pet. 
Geol. , 1984, 378 pp. • 

11. Boreck, D. L. , C. M. Tremain, L. 
Sitowitz, and T. D. Lorenson. The Coal- 
bed Methane Potential of the Sand Wash 
Basin, Green River Coal Region, Colorado. 
CO Geol. Survey OFR 81-6, 1981, 25 pp. 

12. Diamond, W. P. , and G. W. Murrie. 
Methane Gas Content of the Pittsburgh 
Coalbed and Evaluation of Drilling Re- 
sults at a Major Degasif ication Instal- 
lation. Pres. at 12th Ann. Meetings, 
Northeastern Sec. , Geol. Soc. America, 
Binghamton, NY, Mar. 31-Apr. 2, 1977; Ab- 
stract in Programs, v. 9, No. 3, Feb. 
1977, p. 256. 

13. Diamond, W. P. , G. W. Murrie, and 
C. M. McCulloch. Methane Gas Content of 



the Mary Lee Group of Coalbeds, Jeffer- 
son, Tuscaloosa, and Walker Counties, 
Ala. BuMines RI 8117, 1976, 9 pp. 

14. Iannacchione, A. T., and D. G. 
Puglio. Methane Content and Geology of 
the Hartshorne Coalbed in Haskell and 
Le Flore Counties, OK. BuMines RI 8407, 

1979, 14 pp. 

15. Kelso, B. S., S. M. Goolsby, and 
CM. Tremain. Deep Coalbed Methane Po- 
tential of the San Juan River Coal Re- 
gion, Southwestern Colorado. CO Geol. 
Survey OFR 80-2, 1980, 56 pp. 

16. Popp, J. T., and C. M. McCulloch. 
Geological Factors Affecting Methane in 
the Beckley Coalbed. BuMines RI 8137, 

1976, 35 pp. 

17. Steidl, P. E. Geology and Methane 
Content of the Upper Freeport Coalbed 
in Fayette County, Pa. BuMines RI 8226r, 

1977, 17 pp. 

18. Tremain, C. M. The Coalbed Meth- 
ane Potential of the Raton Mesa Coal Re- 
gion, Raton Basin, Colorado. CO Geol. 
Survey OFR 80-4, 1980, 48 pp. 

19. . Coalbed Methane Potential 

of the Piceance Basin, Colorado. CO 
Geol. Survey OFR 82-1, 1982, 49 pp. 

20. Grau, Roy H. , and J. C. LaScola. 
Methane Emissions From U.S. Coal Mines in 

1980. BuMines IC 8987, 1984, 13 pp. 

21. Camp, B. S., F. H. Briscoe, P. G. 
Malone, and C. M. Boyer II. Special Data 
Package, Preliminary Geologic Report-Rock 
Creek Methane From Multiple Coal Seams 
Completion Project, Gas Research Insti- 
tute Contract 5083-214-0847, May 1985, 15 
pp; available upon request from Gas Re- 
search Institute, Chicago IL. 

22. American Society for Testing and 
Materials. Standard Specification for 
Classification of Coals by Rank. D388 in 
1977 Annual Book of ASTM Standards: Part 
26, Gaseous Fuels; Coal and Coke; Atmos- 
phere Analysis. Philadelphia, PA, 1977, 
pp. 214-218. 

23. Diamond, W. P., and D. M. Hyman. 
A Computer-Implemented Data Base for 
Coalbed Methane Resource Characterization 
and Research (Proceedings, Unconventional 
Gas Recovery Symposium, Soc. Pet. Eng. , 
AIME, and U.S. Dep. Energy, Pittsburgh, 
PA, May 16-18, 1982). SPE/DOE 10806, 
1982, pp. 165-169. 



APPENDIX. — RESULTS OF DIRECT-METHOD GAS-CONTENT DETERMINATIONS 

ON U.S. COAL SAMPLES 



Tables A-l and A-2 are a compilation of 
direct-method test results on coal sam- 
ples collected between 1972 and mid-1983. 
The results are listed alphabetically 
by coalbed in table A-l and by State in 
table A-2. To better evaluate the total 
gas content of each sample, the component 
parts of the total are listed. The major 
physical and chemical variables known 
to affect the gas content of coal sam- 
ples are provided if available. Space 
limitations preclude the listing of all 



detailed data associated with each sam- 
ple, but this information may be availa- 
ble for specific samples from the Bu- 
reau's Pittsburgh Research Center. The 
Bureau also has published detailed geo- 
logic studies related to the occurrence 
of methane in selected coal measures. A 
bibliography of these papers, as well as 
other topics related to the occurrence 
and premining drainage of methane, is 
also available from the Pittsburgh Re- 
search Center. 



DISCUSSION OF DATA PRESENTED IN TABLES A-l AND A-2 



Coalbed . — Coalbed names are generally 
those assigned by the cooperating coal 
companies or by other agencies supplying 
samples or data to the Bureau. If the 
name of the coalbed is unknown, either 
the group (GRP) or formation (FM) is 
listed, or the sample is catalogued by 
the State name followed by (UNC) for "un- 
correlated." A question mark (?) fol- 
lowing the coalbed name indicates that 
the name is probably correct, but the 
coal may be miscorrelated. Because of 
space limitations on the computer print- 
out, coalbed names have occasionally been 
abbreviated. Several States utilize a 
numerical or letter designation in addi- 
tion to (or in place of) a name. Where 
this is common practice and when space 
permits, the alternate designation is 
provided in parentheses. The following 
abbreviations for different benches of 
the same coalbed are used in association 
with the coalbed name: (U) = upper, (M) 
= middle, and (L) = lower. In several 
instances, letter designations (in as- 
cending order beginning with A) have been 
assigned to different benches of the same 
coalbed. An R following a coalbed name 
indicates a rider coal. If more than one 
rider is present, numerical designation 
(in ascending order beginning with 1) 
have been assigned. 

State and county . — Coal companies are 
generally reluctant to permit publication 
of the exact location of their explora- 
tory core holes. The location of sample 
collection sites are, therefore, identi- 
fied only by the State and county. 



Sample depth . — The measured depth of 
the bottom of the sample placed in the 
desorption container, rounded off to the 
nearest foot. 

Lost gas . — That portion of the total 
gas content lost before the coal sample 
was sealed in the canister, estimated by 
the graphical procedure described in the 
text. An "ND" in the "Lost gas" column 
indicates that the lost gas could not 
be calculated, usually because of incom- 
plete sample data. Values are at ambient 
conditions. 

Desorbed gas . — That portion of the to- 
tal gas content liberated from the sam- 
ple while it is sealed in the collec- 
tion container and measured directly by 
the water-displacement method described 
in the text. Values are at ambient 
conditions. 

Lost plus desorbed gas (Lost + desrb 
gas) . — Determined by adding the lost and 
desorbed gas and dividing by the total 
sample weight; it represents the gas that 
desorbed from the sample naturally. This 
may be the only valid gas content data 
for those samples for which residual gas 
was determined by the crushing box or 
graphical procedures (2^). This value is 
probably less than the actual total gas 
content of those samples. The values 
shown in this column may not equal the 
combined total of the " Lost gas" and 
"Desorbed gas" components previously dis- 
cussed because of independent rounding of 
the data in those columns. Values are at 
ambient conditions. 



^>MH 



Residual gas and crushing method . — That 
portion of the total gas content of the 
sample remaining in the coal at the end 
of the desorption period, which will not 
freely desorb from the coal while sealed 
in the container. The residual gas has 
been determined by three methods: CB = 
crushing box, G = graphical, and BM = 
ball mill. The crushing box method was 
determined to be unreliable; therefore, 
the graphical procedure based on the 
crushing box must be considered unrelia- 
ble. The residual gas data obtained from 
the ball mill is considered valid. An ND 
or a dash in these columns indicates that 
the value was not determined, usually 
because the donors did not want the sam- 
ples to be crushed. Values are at ambi- 
ent conditions. 

Total gas . — Determined by adding the 
"Lost + desorbed gas" column and the "Re- 
sidual gas" column. The total gas con- 
tent (subject to the validity of the re- 
sidual gas) represents the gas content of 
the coal sample on an as-received basis. 
Laboratory-derived values in cubic cen- 
timeters per gram can be converted to in- 
place values in cubic feet per ton by 
multiplying by 32. Values are at ambient 
conditions. 

Apparent rank (Rank app) . — Determined 
from coal analysis data by the method 
described in ASTM Standards D388 (18). 
The abbreviations (samples from all coal 
groups may not appear in table A-l) cor- 
respond to the following standard coal 
groups: 

M-Ant — Meta-anthracite. 
Ant — Anthracite. 



Semi -Ant — Semianthracite. 
LV — Low-volatile bituminous. 
MV — Medium-volatile bituminous. 
HV-A — High-volatile A bituminous. 
HV-B — High-volatile B bituminous. 
HV-C — High-volatile C bituminous. 
Sub-A — Subbituminous A. 
Sub-B — Subbituminous B. 
Sub-C — Subbituminous C. 
Lig-A — Lignite A. 
Lig-B — Lignite B. 

A dash ( — ) in the "Apparent rank" column 
indicates that a rank determination could 
not be made because of the lack of coal 
analysis data. If the word "None" ap- 
pears in this column, the mineral mat- 
ter content of the sample is too high 
(greater than 50 pet) to assign a coal 
rank. 

Percent ash, as-received proximate 
analysis (Ash ar-p) . — Data are presented 
to permit an evaluation of the possible 
effect of the amount of ash on the total 
gas content of the sample. Because the 
mineral matter represented by the ash in 
the coal analysis adds weight but gener- 
ally no gas, an abnormally low gas con- 
tent may be measured if a high mineral 
matter content is present. An "ND" in 
this column indicates that a coal analy- 
sis was not obtained on the sample. 

U.S. Bureau of Mines identification 
code (USBM ID) . — Code number assigned to 
each coal sample processed for gas con- 
tent determination by the Bureau. All 
inquiries concerning specific samples 
should refer to these code numbers. 



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